Will the 10g sfp+ ports support 1g/gige sfp's (i.e. are the ports 1g and/or 10g capable)?

If you try to use a 1Gbit SFP transceiver that isn’t from MikroTik you will likely at first have problems and it might not work. If this happens you have to go into RouterOS and turn off auto negotiate for that port. You want to manually select the speed as well. Then I’d recommend that you use masking tape or a label maker to mark the physical router so that you or a future user knows that one of the ports has auto negotiate turned off. You’ll actually need to do this with the MikroTik S+RJ10 as well as it has problems sticking too the highest speed your cable can handle (it’s a multi speed 1G/2.5G/5G/10G transceiver) I don’t know if SwitchOS has the same problems.

Do these switches have the ability for mlag? i.e. i want to have two of these as core switches for redundancy.

I don't believe so. You would need to check with MikroTik to see if that feature is available in the Router OS.

Will cisco sfp-10g-sr and sfp-10g-lrm sfp's work in this?

Cisco compatibles have worked well for me. This is not nearly as finicky as a Cisco switch.

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🚀 Elevate your network game with lightning-fast, pro-grade switching!

SLEEK DURABLE DESIGN - Compact metal case fits perfectly on your desk or rack, built to last under heavy workloads.
PLUG AND PLAY SIMPLICITY - Easy setup with managed switch capabilities to keep your network running smoothly.
ENERGY EFFICIENT OPERATION - Consumes just 19W, balancing power and performance for eco-conscious pros.
BLAZING 10 GBPS UPLINK POWER - 8 SFP+ ports deliver ultra-fast data transfer for seamless network performance.
GIGABIT ETHERNET FLEXIBILITY - 1 RJ45 port ensures reliable 1Gbps connectivity for diverse device compatibility.

The MikroTik CRS309-1G-8S+IN is a compact, metal-cased desktop switch featuring 1 Gigabit RJ45 port and 8 SFP+ ports supporting 10Gbps speeds. Designed for professional network environments, it offers robust performance with low power consumption (19W) and rack-mount compatibility, making it ideal for millennial managers seeking reliable, high-speed connectivity.

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Product Dimensions	14.1L x 11.5W x 2.8H Centimeters
Item Weight	1.21 Kilograms
Voltage	12 Volts
Case Material Type	Metal
Upper Temperature Rating	7E+1 Degrees Celsius
Interface Type	RJ45
Data Transfer Rate	1000 Megabits Per Second
Manufacturer	MIKROTIK
Model	CRS309-1G-8S+IN
Item model number	CRS309-1G-8S+IN
Number of items	1
Colour Screen	No
Wattage	19 Watts
Batteries Included	No
Batteries Required	No
Connector Type	Ethernet
Mounting Type	Rack Mount
Includes Rechargeable Battery	No
Programmable Buttons	No
Country of Origin	China
Item Weight	1 kg 210 g

MikroTik 9-Port Desktop Switch, 1 Gigabit Ethernet Port, 8 SFP+ 10Gbps Ports (CRS309-1G-8S+IN)

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